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Special Screws

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Chemical Resistance of Chemical-proof Screws

This page describes "Chemical Resistance of Chemical-proof Screws" such as ceramic, titanium, resin nickel and Inconel.

Plastic and Rubber

This page describes "Plastics and Rubbers" such as ABS, FRP, polycarbonate, polypropylene, silicone rubber and butyl rubber.

Surface Treatment

This page describes "Surface Treatments" such as thermal spraying, induction hardening, nitriding, electroplating, chemical conversion treatment and anodic oxidation.

Aluminum Alloy

This page describes "Aluminum Alloys" such as A5052, A2017, A6063 and A7075.

Steel

This page describes "Steels" such as SS400, SPCC, SPHC, SUJ2 and FC200.

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Property of Screws with Special Surface Treatment

This page describes "Properties of Screws with Special Surface Treatment" such as fluorine coating and molybdenum disulfide coating.

Stainless Steel

This page describes "Stainless Steels" such as SUS304, SUS316, SUS430, SUS316L, SUS303, SUS440C and SUS403.

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Property of High Performance Stainless Steel Screws

This page describes "Properties of High Performance Stainless Steel Screws" such as SUS316L and SUS310S, which are effective for magnetic detection, high strength and heat resistance.

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Property of Special Material Screws

This page describes "Properties of Special Material Screws" such as ceramic, nickel, aluminum, molybdenum, Inconel, Hastelloy and phosphor bronze.

Comparison Table of Material

This page describes "Comparison table of material".

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IPX7 Waterproof Evaluation of Sealing Washers

This is the page for IPX7 waterproof evaluation of sealing washers.

RoHS Compliance (Issuing Certificate)

This page explains the Revised RoHS Directive, NBK's actions for environment and Environmental Reports.

Eccentric Lock Washers™ Comparison Test: Anti-Loosening Performance

We provide anti-loosening test results for NBK’s anti-loosening washer, “Eccentric Lock Washer”.

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Anti-removal measures for interlock devices

According to the ISO 14119 revision (2013), measures are now required to prevent the dismantling, removal, or disabling of interlock devices. Among these measures, the use of a special screw which can only turn in one direction is recommended.

Geometrical Tolerancing

This page describes JIS B 0021 "Geometrical tolerancing−Tolerancing of form, orientation, location and run-out".

Second Moment of Area, Section Modulus, and Turning Radius of Cross Section

This page describes "Cross Section's Area Second Moment, Section Modulus, Rotation Radius".